TABLE 2.
Measure of DOC quantity and FDOM optical characteristicsa
| Site no. | Water color | DOC concn | SAC340 | SUVA254 | Abs254/365 | Humic FDOM (%) | Fulvic FDOM (%) | Protein FDOM (%) |
|---|---|---|---|---|---|---|---|---|
| 1 | Black | 10.9 | 39.5 | 4.5 | 3.8 | 56.7 | 29.5 | 13.8 |
| 2 | Black | 11.7 | 33.5 | 3.7 | 3.6 | 60.3 | 32.6 | 7.1 |
| 3 | Black | 11.4 | 30.5 | 3.6 | 3.8 | 47.2 | 30.3 | 22.5 |
| 4 | Black | 9.8 | 18.9 | 2.4 | 3.8 | 52.3 | 41.0 | 6.7 |
| 5 | Black | 7.1 | 29.1 | 3.4 | 4.0 | 54.2 | 37.3 | 8.5 |
| 6 | White | 6.0 | 19.1 | 2.2 | 4.3 | 50.8 | 39.7 | 9.5 |
| 7 | White | 7.1 | 19.1 | 1.4 | 2.2 | 34.7 | 36.2 | 29.1 |
| 8 | White | 9.1 | 11.7 | 2.1 | 6.4 | 37.5 | 45.6 | 16.8 |
| 9 | White | 5.7 | 20.0 | 2.6 | 4.2 | 50.6 | 40.4 | 9.0 |
| 10 | White | 8.0 | 22.1 | 3.0 | 4.6 | 46.2 | 41.8 | 12.0 |
| 11 | White | 5.7 | 20.1 | 2.6 | 3.8 | 49.0 | 39.3 | 11.7 |
| 12 | White | 6.5 | 14.2 | 2.2 | 4.7 | 43.9 | 45.3 | 10.8 |
| 13 | Clear | 4.9 | 6.1 | 1.2 | 7.1 | 30.6 | 42.3 | 27.1 |
| 14 | Clear | 2.7 | 8.7 | 1.9 | 5.0 | 44.8 | 38.3 | 16.9 |
| 15 | Clear | 4.6 | 11.7 | 1.9 | 5.3 | 35.1 | 45.0 | 20.0 |
a
SAC340 and SUVA254 are the specific absorbance coefficients index of relative DOM aromaticity (the higher the values, the more aromatic is the DOM). Abs254/365 is the index of molecular weight (the lower the value, the higher the molecular weight of the DOM). DOC, dissolved organic carbon; DOC concn, DOC concentration in mg/liter; DOM, dissolved organic matter; FDOM, fluorescent dissolved organic matter.